The Van Mark 1/4in. Magnetic Driver is designed to install both 3 in. anchor screws and 3/8 in. stainless cover screws with the brackets, thus installing the gutter hoods. Trim-A-Gutter bit drivers are manufactured from hardened steel and work with most corded and cordless drill to attach 5 in. and 6 in. gutter hood and gutter brackets into place. Made from a hardened steel material, the Van Mark Magnetic Driver will fit most drills and drivers and securely holds the screw until it is installed.